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CLW Trade Apprentice Exam questions

* In single core cables armouring is not done to
(a) either of the above
(b) make it flexible
(c) avoid excessive sheath losses
(d) none of the above

Answer: (c) avoid excessive sheath losses

* The bedding on a cable consists of
(a) hessian cloth
(b) jute
(c) Jute or  hessian cloth
(d) none of the above

Answer: (c) Jute or  hessian cloth

* Which of the following load normally needs starting torque more than the rated torque?
(a)  Transmitters
(b) Air compressors
(c) Conveyors
(d) Centrifugal pumps

Answer: (c) Conveyors

* By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C.
motor?
(a) Frame
(b) Shaft
(c) Insulator
(d) Commutator
Answer: (d) Commutator

*A direct on line starter is used: for starting motors
(a) up to 10 H.P.
(b) iip to 5 H.P.
(c) iip to 15 H.P.
(d) iip to 2.5 H.P.

Answer: (b) iip to 5 H.P.

* For starting a D.C. motor a starter is required because
(a) it controls the speed of the motor
(b) it starts the motor
(c) it limits the starting current to a safe value
(d) it maintains the power variation

Answer: (c) it limits the starting current to a safe value
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